Abstract: Co-channel
interference among Device-to-device (D2D) users is major issue to be solved
when utilizing the same frequency bands. Consequently, interference alignment
(IA) as an effective interference management approach has been implemented to
D2D communications for the frequency sharing. However, the measurement of
channel state information (CSI) between transmitter and receiver of a D2D pair
and cross-channel state information (C-CSI) among D2D pairs are the major
issues that need to be resolved for the implementation of IA from theory to
practical. Therefore, in this paper, we propose an effective D2D discovery
scheme to overcome this problem, which can measure the CSI and C-CSI based on
the discovery messages. Simulation results show that, under perfect conditions,
even though the proposed D2D discovery scheme increases the needed time slots
to establish D2D communications by 6.2% compared with the conventional D2D
discovery without considering IA, it increases the throughput up to 50% than
the conventional D2D without considering IA, i.e., it improves the spectrum
efficiency.